A member of www.1000rr.net
brought to my attention a discoloration issue with the silver/black CRB1000RR's ( it's his pic ).
On the right side of the bike, in the upper opening, you will notice the overflow hose running between the radiator and plastic. Owners have noticed discoloration that seems to follow the overflow hose. I have this as well.
What's not clear is if the hose is causing the problem by transferring heat from the radiator, getting hot itself, or if the radiator itself is causing this. I have chosen to wait and see if Honda issues a service bulletin, since replacing the plastic would just lead to the same problem. If this does not happen soon, i will re-route the overflow hose, have the plastic replaced, and hope for the best.
There have been some reports of this with other colors, but the silver/black seems to be the most prolific offender.
Check your bike. If you have this problem, i don't think getting the plastic replaced is an issue, but please call Honda customer service ( 1-866-784-1870 ) and let them know this problem is going on so we can get acknowledgment from Honda, just in case it's the radiator, and not the hose.